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1891. [func] Limit the number of recursive clients that can be

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waiting for a single query (<qname,qtype,qclass>) to
                        resolve.  New options clients-per-query and
                        max-clients-per-query.
This commit is contained in:
Mark Andrews
2005-06-27 00:15:45 +00:00
parent 096103ae0d
commit fd780f3d47
11 changed files with 233 additions and 22 deletions
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40
doc/arm/Bv9ARM-book.xml
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@@ -18,7 +18,7 @@
- PERFORMANCE OF THIS SOFTWARE.
-->
<!-- File: $Id: Bv9ARM-book.xml,v 1.273 2005/06/20 01:11:57 marka Exp $ -->
<!-- File: $Id: Bv9ARM-book.xml,v 1.274 2005/06/27 00:15:42 marka Exp $ -->
<book>
<title>BIND 9 Administrator Reference Manual</title>
@@ -1522,6 +1522,42 @@ controls {
</listitem>
</varlistentry>
<varlistentry>
<term><command>clients-per-query</command></term>
<term><command>max-clients-per-query</command></term>
<listitem>
<para><command>clients-per-query</command>
and <command>max-clients-per-query</command> set the
initial value (minimum) and maximum number of recursive
simultanious clients for any given query
(&lt;qname,qtype,qclass&gt;) that the server will accept
before dropping additional clients. named will attempt to
self tune this value and changes will be logged. The
default values are 10 and 100.
</para>
<para>
This value should reflect how many queries come in for
a given name in the time it takes to resolve that name.
If the number of queries exceed this value named will
assume that it is dealing with a non-responsive zone
and will drop additional queries. If it gets a response
after dropping queries it will raise the estimate. The
estimate will then be lowered in 20 minutes if it has
remained unchanged.
</para>
<para>
If <command>clients-per-query</command> is set to zero
then there is no limit on the number of clients per query
and no queries will be dropped.
</para>
<para>
If <command>max-clients-per-query</command> is set to zero
then there is no upper bound other than imposed by
<command>recurive-clients</command>.
</para>
</listitem>
</varlistentry>
</variablelist>
</sect3>
@@ -4396,6 +4432,8 @@ category notify { null; };
<optional> use-additional-cache <replaceable>yes_or_no</replaceable> ; </optional>
<optional> acache-cleaning-interval <replaceable>number</replaceable>; </optional>
<optional> max-acache-size <replaceable>size_spec</replaceable> ; </optional>
<optional> clients-per-query <replaceable>number</replaceable> ; </optional>
<optional> max-clients-per-query <replaceable>number</replaceable> ; </optional>
<optional> masterfile-format (<constant>text</constant>|<constant>raw</constant>) ; </optional>
};
</programlisting>